INDUSTRIAL SEMINAR ON NHPC TLDP-III

PRESENTED BY:-NAME-RANJAN KUMAR JHAROLL NO.-11901611072DEPT.- ELECTRICAL ENGINEERING

INTRODUCTION TO HYDROELECTRIC POWER PLANT

IN HYDROELECTRIC POWER PLANTS THE POTENTIAL ENERGY OF WATER

STORED AT A HEIGHT IS CONVERTED INTO ELECTRICAL

ENERGY.

THE HYDROELECTRIC POWER DEPENDS ON :-

1. HEAD OF WATER.

2. DISCHARGE OF WATER.

TOTAL POWER THAT CAN BE GENERATED IS:-

P= (0.736*W*H*Q*ƞ/75) KW

INTRODUCTION TO TLDP-III

TEESTA LOW DAM PROJECT-III WAS ENTRUSTED TO NHPC ON 15TH NOV,

2000.

TECHNICAL FEATURES OF TLDP-III :-

LOCATION ON RIVER TEESTA IN DARJEELING (W.B)

HEAD 20 m

CAPACITY 132 MW (4 X 33 MW)

PROJECT COST Rs. 768.92 CRORES

ANNUAL GENERATION 594.07 MU

HEIGHT OF BARRAGE/LOW DAM 32.5 m HIGH (RCC RAFT WITH PIERS)

TAIL RACE CHANNEL 100 m

SWITCHYARD 220 KV GAS INSULATED SWITCHGEAR

EVACUATION OF POWER 01 LINE TLDP-III TO NEW JALPAIGURI

TWO MAIN PARTS OF TLDP-III

1. BARRAGE

IN TLDP-III 140 m LONG BARRAGE HAS BEEN CONSTRUCTED ACROSS

RIVER TEESTA AT 27 MILES FROM RAMBI.

THE HEIGHT OF THE BARRAGE IS 32.5m AND HAVING 7 GATES.

2. POWER HOUSE

TLDP-III CONSISTS OF A UNDERGROUND AND SURFACE

POWER HOUSE.

POWER HOUSE OF TLDP-III CONSISTS OF: -

PRIMARY COOLING FLOOR.

SECONDARY COOLING FLOOR.

TURBINE FLOOR.

GENERATOR FLOOR.

MACHINE HALL.

CONTROL ROOM.

PRIMARY COOLING FLOOR

LOCATED AT AN ELEVATION OF 176.5 M.

IT IS OPEN WATER CIRCULATING SYSTEM.

SPECIFICATION OF PRIMARY COOLING FLOOR:-

NO. OF PUMP MOTOR SET 6

RATING OF THE MOTOR 55 KW

NO. OF DUPLEX STRAINER 6

LENGTH OF RAW WATER HEADER 76.5 M

LENGTH OF DELIVERY WATER HEADER 70 M

SECONDARY COOLING FLOOR

LOCATED AT AN ELEVATION OF 180.25 M.

IT IS A CLOSED CIRCULATING SYSTEM.

SPECIFICATION OF SECONDARY FLOOR: -

NO. OF PUMP MOTOR SET 8

RATING OF THE MOTOR 45 KW

NO. OF SIMPLEX STRAINER 4

NO. OF CYCLONE SEPERATOR 1

NO. OF HEAT EXCHANGER 5

TURBINE FLOOR

THIS FLOOR IS LOCATED AT AN ELEVATION OF 184.5 M.

THE TURBINE EMPLOYED AT TLDP – III IS KAPLAN TURBINE (VERTICAL

CONFIGURATION).

RATED OUTPUT OF EACH TURBINE IS 34MW.

TYPE OF SEALING: -

• SHAFT SEAL

• MAINTENANCE SEAL

GENERATOR FLOOR THIS FLOOR IS LOCATED AT AN ELEVATION OF 187.25 M.

IN THE ALTERNATOR OF TLDP-III, THE CONSTRUCTION OF ROTOR IS

SALIENT-POLE TYPE & THE STATOR WINDING IS OF Y-CONNECTED TO LINE.

IN TLDP-III THE EXCITATION SYSTEM IS STATIC, DIGITAL & CONSTANT-

VOLTAGE TYPE WITH CONTROLLED THYRISTORS.

SPECIFICATION OF ALTERNATOR: -RATED SPEED 136.36 RPM

RATED FREQUENCY 50 Hz

RATED OUTPUT 36670 KVA

RATED CURRENT 1924.7 AMP

RATED VOLTAGE 11000 ±10% VOLTS

RATED POWER FACTOR 0.9

RATED FIELD VOLTAGE 118 VOLTS

CONNECTION STAR-2 FOLD PARALLEL

MACHINE HALL

THE ELEVATION OF MACHINE HALL IS 190.5M.

THE MACHINE HALL HAS FOLLOWING INSTALLATIONS: -

1. OPU & GCP

2. EXCITATION CONTROL BOARD.

3. OPU CONTROL BOARD.

4. UNIT CONTROL BOARD.

CONTROL ROOM

THE ELEVATION OF CONTROL ROOM IS 190.5M.

THE WHOLE PLANT IS CONTROLLED THROUGH SCADA (SUPERVISORY

CONTROL AND DATA ACQUISITION).

IN TLDP-III THERE ARE TWO SERVER NAMELY SERVER A & SERVER B.

CONTROL ROOM HAS TWO MORE ROOM, THEY ARE: -

1. BATTERY ROOM

2. LTAC ROOM

LIST OF IMPORTANT INSTALLATIONS IN TLDP-III

WORKING PRESSURE: -

HP COMPRESSOR:- 68 BAR

LP COMPRESSOR:- 7.8 BAR.

ROLE OF HP COMPRESSOR: -

PROVIDES AIR PRESSURE TO OIL PRESSURE UNIT (OPU)

AIR IS PROVIDED TO LP COMPRESSOR FROM HP COMPRESSOR.

ROLE OF LP COMPRESSOR: -

PROVIDES AIR FOR SERVICE.

PROVIDES PRESSURE TO THE MAINTENANCE SEAL.

FOR BRAKING PURPOSE.

1. HP & LP COMPRESSOR: -

2. HIGH PRESSURE OIL SYSTEM (HPOS)

HPOS IS USED TO CREATE AN OIL FILM IN BETWEEN THRUST PAD AND

THRUST COLLAR.

ROTOR IS ROTATING ON THIS OIL FILM.

HPOS HAS TWO MOTORS OF SAME RATING.

ONE OF THEM IS AC AND ANOTHER ONE IS DC MOTOR.

AT A TIME ONLY ONE IS OPERATED.

3. OPU

USED TO CONTROL THE RUNNER BLADES AND GUIDE VAN.

THE OPERATING PRESSURE IS 57 TO 62 BAR.

IN OPU TANK RATIO OF OIL AND AIR IS IN 60 : 40.

4. TRANSFORMERS

IN TLDP-III ON THE BASIS OF WORKING THERE ARE SIX TRANSFORMERS

USED FOR EACH INDIVIDUAL UNIT.

THEY ARE AS FOLLOWS: -

1. GENERATOR TRANSFORMER (GT).

2. UNIT AUXILIARY TRANSFORMER (UAT).

3. SERVICE STATION TRANSFORMER (SST).

4. EXCITATION TRANSFORMER (ET).

5. LIGHTING ARRESTER VOLTAGE TRANSFORMER (LAVT).

6. NEUTRAL GROUNDING CUBICLE (NGC).

5.GAS INSULATED SWITCHGEAR

USED TO CONTROL, PROTECT AND ISOLATE ELECTRICAL EQUIPMENT.

SWITCHGEAR IS THE COMBINATION OF ELECTRICAL SWITCHES, ISOLATORS &

CIRCUIT BREAKERS.

SULPHUR HEXAFLUORIDE GAS ACT AS THE INSULATING MEDIUM.

6. SUBSTATION

IN TLDP-III THERE IS A SMALL SUBSTATION ON THE ROOF OF GIS

BUILDING.

SUBSTATIONS GENERALLY HAVE SWITCHING, PROTECTION AND CONTROL

EQUIPMENT AND TRANSFORMERS.

THERE ARE TWO NUMBER OUTPUT LINES OF 220 KV.

NO. OF WAVE TRAP IS FOUR.

7. DEWATERING & DRAINAGE SYSTEM

1. DRAINAGE SYSTEM: -

A. USED TO DRAIN OUT LEAKAGE WATER OF THE PLANT TO THE RIVER.

B. FOR THIS PURPOSE TWO 90 KW MOTOR IS USED.

2. DEWATERING SYSTEM: -

A. USED TO DRAIN OUT WATER IN BETWEEN INTAKE GATE AND DRAFT

TUBE AT THE TIME OF MAINTENANCE.

B. FOR THIS PURPOSE SIX 90 KW MOTOR IS USED.

8. PROTECTION SYSTEM

VITAL INSTALLATION FOR POWER PLANT.

IN TLDP-III THERE ARE SEVERAL TYPES OF PROTECTION TO PROTECT

IMPORTANT COMPONENTS USING SEVERAL TYPES OF RELAYS: -

GENERATOR PROTECTION.

BUS-BAR PROTECTION.

TRANSFORMER PROTECTION.

LINE PROTECTION.

FIRE FIGHTING SYSTEM: -

USE OF CO2

USE OF WATER

CONCLUSION

I WOULD LIKE TO SAY THAT THIS TRAINING IS AN EXCELLENT OPPORTUNITY

FOR ME.

THE MAIN OBJECTIVES OF THIS INDUSTRIAL TRAINING ARE TO OBSERVE AND

PRACTICE HOW THE BASIC MACHINE KNOWLEDGE AND ENGINEERING IS

APPLICABLE IN THE REAL INDUSTRIES.

IT IS NOT ONLY TO GET TECHNICAL EXPERIENCE BUT ALSO TO OBSERVE

MANAGEMENT PRACTICE AND HOW TO INTERACT WITH FELLOW WORKERS.

THANK YOU!